The Nitecore UM10 Charger is a single bay battery charger that is capable of charging both a battery and an external device simultaneously. The UM10 charger is compatible with most lithium-ion / IMR batteries and comes equipped with a usb charging input and output to give it the ability to also charge external devices. This charger also features a LCD display, overcharge prevention, and reverse polarity protection. This is a newly added product, full description coming soon.